Original Articles

Seasonal uptake and distribution of nutrient elements by kiwifruit vines 2. Micronutrients

Published in: South African Journal of Plant and Soil
Volume 6, issue 4, 1989 , pages: 265–270
DOI: 10.1080/02571862.1989.10634524
Author(s): W., A.G. Kotzé, Republic of South Africa, Johanna de Villiers, Republic of South Africa

Abstract

Uptake and distribution of micronutrients by kiwifruit vines (Actinidia deliciosa (A. Chev.) C.F. Liang et A.R. Ferguson var. deliciosa) cv. Hayward were studied in sand culture. The period of rapid accumulation of different micronutrients differed substantially. Zinc was accumulated mainly over a 12-week period after bud break, manganese over a 17-week period, boron and iron over a 24-week period and copper over a 27-week period. There was no indication of translocation of micronutrients from leaves to fruit before harvest, reflecting the lower mobility of these elements in the plant and a lower demand by the developing fruit. It was furthermore confirmed that zinc is probably not highly mobile in kiwifruit vines, although the opposite has been suggested in the past. The largest amounts of manganese, iron and boron were accumulated in leaves, whereas the largest amounts of zinc and copper were found in roots. With the exception of boron, fruit was a relatively unimportant sink for micronutrients. Substantial amounts of manganese, zinc and iron were lost from the leaves after harvest, before leaf drop. There were some indications of increased content of these nutrients in the permanent parts of the vine and at least some of these nutrients might have been transported out of the leaves before senescence. However, no indication was found in the present study of translocation of micronutrients from the permanent part of the vine to new growth during the early part of the growing season. In general, the kiwifruit vine has a low requirement for micronutrients.

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